U.S. stocks finished lower Monday, with all three major indexes falling about 0.1 percent. The Dow Jones industrial average fell 21.73, or 0.2 percent, to 13,971.24. The broader Standard & Poor's 500 index fell 0.92, or 0.1 percent, to 1,517.01. The technology-heavy Nasdaq composite index fell 1.86, or 0.1 percent, to 3,192.01.